Atshan, Ali. “Classified According to Boxers (Sports Confidence As A Feature and Competitive Behavior) and Their Impact on the Effectiveness of Skill Performance of Iraq Boxing Clubs for Applicants (Medium Category)”. Journal of Physical Education, vol. 28, no. 1, Mar. 2016, pp. 212-25, https://doi.org/10.37359/JOPE.V28(1)2016.127.